Washington's Birthday, also known as Presidents' Day, is a federal holiday held on the third Monday of February. The day honors presidents of the United States, including George Washington, the USA's first president. George Washington was the first president of the United States of America.
Complement component 5 is a protein that in humans is encoded by the C5 gene.Complement component 5 is involved in the complement system. It is cleaved into C5a and C5b: 1  C5a plays an important role in chemotaxis.2  C5b forms the first part of the complement membrane attack complex.omplement component 5 is the fifth component of complement, which plays an important role in inflammatory and cell killing processes.
2-5. Complement is a system of plasma proteins that interacts with pathogens to mark them for destruction by phagocytes. In the early phases of an infection, the complement cascade can be activated on the surface of a pathogen through any one, or more, of the three pathways shown in Fig. 2.8.